Complementary angles are angle pairs whose measures sum to one right angle If the two complementary angles are adjacent their non-shared sides form a right angle. In Euclidean geometry, the two acute angles in a right triangle are complementary, because the sum of internal angles of a triangle is 180 degrees, and the right angle itself accounts for ninety degrees..
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Complementary angles are those angles whose sum is equal to 90. They usually share a common arm.